Dowel-pin-pointing machine



DOWEL PIN POINTING MACHINE.

(Application filed Dec. 10, 1895.

(No Model.)

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WITNESSES. N I INVENTOH i w 1 A (Va/WW 2&5 I15 M a BY ATTORNEYS ma "cams PETERS o0, PHOTO-LH'HO wnsmuow. a. c.

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No. 608,924. Patent ed Au 9 m9 c. F. STEWART. g

DOWEL PINPOINTINGMAGHINE.

(Apph t1 nfil d1) 10 1896) (N0 Modal.)

WITNESSES.-

(iwallv Patented Aug. 9, I898.-

0. F. STEWART. DOWEL PIN PDINTING MACHINE.

(Application filed Dec. 10, 1896.

3 Sheets-Sheet 3.

(N0 Model.)

w uH UHM llVVE/VTUR ATTORNEYS i STATES,

DOWEL-PIN-PIOLNTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 608,924, dated August 9, 1898.

Application filed December 10,1896;- sen i No. 615,099. on model.)

To all whom it may concern:

Be it known that I, CLARENCE F. STEWART,

of Norwalk, Huron county, Ohio, have inventing or chamfering the, ends of dowel pins for;

the purpose of allowing the dowel-pin to enter more freely and also preventing the shredding of the dowel pin while being driven home.

It is a well-known fact in themanufacture of dowel-pins that unless the ends are point ed the dowel will either not freely enter the orifice provided for it or when being forced into said orifice will enlarge the hole, and thus produce a loose fit, or the dowel-pin itself will shred and buckle in the hole, either resulting in the splitting of the wood into which it is driven or in the destruction of the dowel-pin by breaking the dowel-pin 0E short in the hole or splitting the dowel-pin. This difficulty it has been tried to obviate byparing or chamfering the ends of the dowel-pin, so

as to make them freely enter the hole; but this manner of pointing the dowels is objectionable, for the reason that the outer fibers of the wood would still catch at the edges of the hole, (especially in the case where the wood into which the dowel was driven was harder or more firm than the wood of the dowel,) and thus the fiber at theouter part of the dowel-pin was torn away and shredded either part way of the length of the dowel and then, buckling upward, is forced into the hole with the dowel and splits the wood'or causes the dowel to split, or where the shred ding of the fiber is the full length of the dowel it often results that the dowel is loose in its hole, which is a serious objection.

The object of my inventionis to obviate the above-recited objections and produce a dowel-pin which is pointed at both ends by compressing the ends, and thus producing a chamfered point which will freely enter the hole and will not shred or strip.

My invention consists in constructing a in side elevation of the same.

machine whichperforms a function of com pressing or pointing the ends of the dowelpin, so as to chamfer them, whereby they will easily enter the holes intended for their reception,and when coated with glue, as they which it holds together.

In the drawings, Figure I is a plan View illustrating my machine. Fig. II is a View Fig. III is a longitudinal vertical section takenthrough line a: a, Fig. I., Fig. IV is a sectional View illustrating more clearly the" feeding device of the machine. Fig. V is an enlarged view illustrating the operating mechanism of the feeding device, and Fig. VI is a sectional view illustrating one of the pointing-dies and its holding-clamp.

A represents a bed which is of any con venient and suitable material and shape. In this bed at its rear end is journaled a shaft B, which is mounted in bearingsb b. At one end of this shaft is a crank O, which is se ,curely attached to the shaft and revolves with it.

' 0 represents a wrist-pin secured to crank O in any suitable manner.

D represents a pitman which is provided at that end nearest the wrist-pin with a housingD", in which is secured a block D At the forward end of the pitman D it is pivoted or hinged to a sliding block or cam E, which is retained in position and guided by a housing E in such a manner as to allow said block or cam E to slide back and forth as it is operated byorank wheel 0 through the pitman D.

The upper face of the sliding block or cam E is provided with a groove, preferably of the shape shown in Fig. V, into which fits a roller f, which 'is secured to one end of a sliding barIj f represents an adjustable feeding-device which is's'ecured to the bar F at the end opposits that end at which the roller f. is secured. This feeding device f is preferably formed with a hollow or concave finger f, the outer or extreme end of which is slightly lower than the inner end. Secured to this feeding device,so as to extend slightly above the extreme end of the finger f*, is a spring f the object of which will be hereinafter set forth.

f represents a spring which is secured to a frame 1 1 at its upper end and is free at its lower end. This spring f extends slightly below the highest part of the feeder f and just outside of its extreme end when the feeder is pushed toward the pointing-dies and acts to hold and adjust the dowel-pin in the feeding device while it is being fed to the pointingdies, as shown in Fig. IV. It will be noticed that spring f is so adjusted and located as to bear both laterally and vertically against the dowel-pin while it is in the finger of the feeder f.

I represents the feeding-hopper, which may be of any preferred construction, but is preferably formed, as shown in Figs. II and IV, with side guides v; i and top guides t" 2". These top guides t t" I prefer to form of some transparent material, such as mica or glass, for the purpose of detecting the disarrangement of the dowel as they slide along the hopper, and thus preventing the misadjusted pin from clogging the machine. The lower end of the hopper I is located so as to feed the dowel-pins one at a time into the fingerf when said finger is drawn back or away from the pointing-dies. (See Fig. V.)

J J represent the pointingdies, which are formed with cup-shaped or conical recessesj, as illustrated in sectional view, Fig. VI. The die J is mounted in a bearing or slide J in such a manner as to allow it to freely reciprocate, and the die J is also mounted in a bearing J which allows of its freely reciprocating, it being preferable that both dies shall move toward and from each other in unison and that both shall move toward its end of the pin when in the act of pointing and away from the pin after the function has been performed. This prevents the pin from sticking in the die and also prevents the outer fibers of the pin from buckling while being pointed, as is the result where one of the dies only reciprocates.

' My preferred manner of operating the dies J and J is as follows, as illustrated in Figs. I and III: On shaft B, toward its central portion, I provide an eccentric or crank K, which operates a pitman K, to which it is secured at one end of the pitman. The other end of the pitman is hinged to a slide K, which is housed on the bed A in such a manner as to allow it to freely reciprocate. The slide K clamps and holds the die J as shown more clearly in Fig. 'VI, in such a manner that it may be adjusted forward or rearward.

The die J is operated by means of an cecentric L, secured to shaft 13, which in turn operates a pitman L, the outer end of pitman L being attached by a pivot or hinge to a sliding bar L which in turn is pivoted to a pivoted lever L The lever L is in turn pivoted to a slide-bar L as at Z, and thus it will be seen that as the pitman L is operated by the eccentric'the slid e-bar L with its die J, is reciprocated.

M represents what I call a kicker or releasing device for knocking or releasing the dowel-pins from either pointing-die in case they should stick. This kicker end is preferably constructed and operated as follows:

on m are two arms, preferably constructed as shown in the drawings. These arms m m are secured to one end of a lever M, which in turn is pivoted to the bed A of the machine, as at m, and at its other end engages a cam O, secured'to the shaft B. It will thus be seen that as the shaft B revolves the arms m m are caused to reciprocate vertically, and inasmuch as their line of travel passes through a line coincident with the center of the pointing-die they will engage the dowel-pin upon their downward stroke. This downward stroke of the arms m m is so timed as to be coincident with the withdrawal of the pointing-dies from the dowel-pin.

The operation of my machine is as follows: The machine having been started and the hopper I filled with dowel-pins, said dowelpins are fed one by one to the finger f 2 of the feeder f. This feeder f being attached to the bar F is, through the medium of the roller f and the groove E in the block E, caused to advance toward the pointing-die and in such a manner as to feed the dowel-pin to such a position directly opposite the center of said die. As the feeder or finger f advances the spring f comes in contact with the dowel-pin held in said finger and binds said dowel-pin into proper position in the feeder, directing both ends of the dowel-pin, as heretofore stated, directly toward the cen ter of the respective pointing-dies and holding said dowel-pin until the dies J J advance and point its ends. Meanwhile and while the dowel-pin is held firmly between the pointing-dies the machine is so adjusted as to operate the sliding block E, so as to cause the feeder to be withdrawn.

Now if the outer or extreme end of the feeder were of sufficient height to hold the pin and prevent it from rolling off the result would be that when the feeder was withdrawn the dowel-pin would be either broken in two or marred crosswise, and in order to obvi ate this I have made the extreme point of the finger f considerably lower down than its inner side and provided a spring f This spring f as the feeder is withdrawn gives and slips under the dowel-pin without in any manner either breaking or injuring either the pin or the feeder. After the feeder has released the pin and is on its way back to receive another dowel the pointing-dies are both withdrawn or forced back and away from the ends of the pin, and the pin thus pointed falls into a suitable receptacle beneath the machine. In order to prevent the pin from sticking in either die, as might result in some cases, I provide what I call. a

kicker or release device, which is operated as hereinbefore described, and in its downward movement strikes the pin away from the die.

What I claim is-- 1. In a machine for pointing dowel-pins, the combination with a reciprocating feeding device, of reciprocating pointing-dies, and

'means for forcing said dies toward and away from each other.

2. In a machine for pointing dowel-pins, the combination with a hopper, of a reciprocating feeder, a pair of pointing-dies, means for moving said dies toward and away from each other, and means for guiding and supporting the dowel-pin while being pointed.

3. 'In a machine for pointing dowel-pins, the combination With a hopper, of a reciprocating feeder provided with a concave finger, and a spring secured to said finger, means for guiding and supporting the dowel-pin while being fed to the dies, a pair of reciprocating pointing dies, and means for moving said dies.

4. In a machine for pointing dowel-pins, the combination with a hopper and reciprocating feeder, of a pair of pointing-dies, means for moving said dies toward and from each other, a device for guiding and supporting the dowel-pin while it is being fed to the dies and a reciprocating device adapted to strike the dowel-pin after the pointing-dies separate.

5. In a machine for pointing dowel-pins, the combination with a hopper, of a reciprocatin g feeder arranged below the hopper and adapted to receive the pins therefrom singly,

a pair of pointing-dies adapted to act simultaneously on both ends of the pin, means for moving said dies toward and from each other, a spring device for supporting the pin while it is being pointed and a vertically-reciprocating striking device for releasing the pin after the pointing-dies separate.

6. In a machine for pointing dowel-pins, the combination with a hopper, of a feeding device, a sliding block for reciprocating said feeding device, a pair of pointing-dies adapted to operate simultaneously on both ends of the pin, a spring arranged adjacent to the end of said feedingdevice to support the dowel pin, means for operating said dies, and a vertically-reciprocating striking device for releasing the pin after it is pointed.

In testimony whereof I sign this specification, in the presence of two witnesses, this 16th day of November, 1896.

CLARENCE F. STEWART.

Witnesses:

E. G; BOUGHTON, W. E. DONNELLY. 

